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    <h1>
      Add-Ons
    </h1>
    <div class="subHeader"></div>

    <p>The React add-ons are a collection of useful utility modules for building React apps. <strong>These should be considered experimental</strong> and tend to change more often than the core.</p>

<ul>
<li><a href="animation.html"><code>TransitionGroup</code> and <code>CSSTransitionGroup</code></a>, for dealing with animations and transitions that are usually not simple to implement, such as before a component&#39;s removal.</li>
<li><a href="create-fragment.html"><code>createFragment</code></a>, to create a set of externally-keyed children.</li>
</ul>

<p>The add-ons below are in the development (unminified) version of React only:</p>

<ul>
<li><a href="perf.html"><code>Perf</code></a>, a performance profiling tool for finding optimization opportunities.</li>
<li><a href="test-utils.html"><code>ReactTestUtils</code></a>, simple helpers for writing test cases.</li>
</ul>

<h3>Legacy Add-ons</h3>

<p>The add-ons below are considered legacy and their use is discouraged.</p>

<ul>
<li><a href="pure-render-mixin.html"><code>PureRenderMixin</code></a>. Use <a href="/docs/react-api.html#react.purecomponent"><code>React.PureComponent</code></a> instead.</li>
<li><a href="shallow-compare.html"><code>shallowCompare</code></a>, a helper function that performs a shallow comparison for props and state in a component to decide if a component should update.</li>
<li><a href="update.html"><code>update</code></a>. Use <a href="https://github.com/kolodny/immutability-helper"><code>kolodny/immutability-helper</code></a> instead.</li>
</ul>

<h3>Deprecated Add-ons</h3>

<p><a href="two-way-binding-helpers.html"><code>LinkedStateMixin</code></a> has been deprecated.</p>

<h2>Using React with Add-ons</h2>

<p>If using npm, you can install the add-ons individually from npm (e.g. <code>npm install react-addons-test-utils</code>) and import them:</p>
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kr">import</span> <span class="nx">Perf</span> <span class="nx">from</span> <span class="s1">&#39;react-addons-perf&#39;</span><span class="p">;</span> <span class="c1">// ES6</span>
<span class="kd">var</span> <span class="nx">Perf</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">&#39;react-addons-perf&#39;</span><span class="p">);</span> <span class="c1">// ES5 with npm</span>
</code></pre></div>
<p>When using a CDN, you can use <code>react-with-addons.js</code> instead of <code>react.js</code>:</p>
<div class="highlight"><pre><code class="language-html" data-lang="html"><span class="nt">&lt;script </span><span class="na">src=</span><span class="s">&quot;https://unpkg.com/react@15/dist/react-with-addons.js&quot;</span><span class="nt">&gt;&lt;/script&gt;</span>
</code></pre></div>
<p>The add-ons will be available via the <code>React.addons</code> global (e.g. <code>React.addons.TestUtils</code>).</p>


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